What is the percentage of carbon dioxide in inhaled and exhaled air? [2 MARKS]
Each point: 1 Mark 1. Percentage of carbon dioxide in inhaled air is 0.04% 2. Percentage of carbon dioxide in exhaled air is 4.4%
What is the percentage of carbon dioxide inhaled from and exhaled into the air? [2 MARKS]
The percentage of carbon dioxide in exhaled air is ___________.